The linearity of the El Niño teleconnection to the Amundsen Sea region
El Niño Southern Oscillation (ENSO) drives interannual variability in West Antarctic climate through altering atmospheric circulation in the Amundsen Sea region (ASR). The El Niño–ASR teleconnection is known to be strongest in austral winter and spring, but its variation with El Niño amplitude is un...
Published in: | Quarterly Journal of the Royal Meteorological Society |
---|---|
Main Authors: | , |
Format: | Text |
Language: | English |
Published: |
John Wiley & Sons, Ltd
2020
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7317404/ https://doi.org/10.1002/qj.3731 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:7317404 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:7317404 2023-05-15T13:23:55+02:00 The linearity of the El Niño teleconnection to the Amundsen Sea region Yiu, Yu Yeung Scott Maycock, Amanda C. 2020-02-03 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7317404/ https://doi.org/10.1002/qj.3731 en eng John Wiley & Sons, Ltd http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7317404/ http://dx.doi.org/10.1002/qj.3731 © 2019 The Authors. Quarterly Journal of the Royal Meteorological Society published by John Wiley & Sons Ltd on behalf of the Royal Meteorological Society. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Q J R Meteorol Soc Research Articles Text 2020 ftpubmed https://doi.org/10.1002/qj.3731 2020-07-05T00:46:22Z El Niño Southern Oscillation (ENSO) drives interannual variability in West Antarctic climate through altering atmospheric circulation in the Amundsen Sea region (ASR). The El Niño–ASR teleconnection is known to be strongest in austral winter and spring, but its variation with El Niño amplitude is underexplored. This study uses experiments from the HadGEM3‐A climate model to investigate the El Niño–ASR teleconnection for a range of imposed SST perturbations spanning weak (0.75 K) to strong (3 K) amplitudes. In austral winter, the El Niño–ASR teleconnection behaves linearly for El Niño amplitudes up to 2.25 K, but is found to weaken for stronger forcing (3 K). The anomalous Rossby wave source in the subtropical South Pacific increases monotonically with El Niño amplitude. However, a Rossby wave reflection surface originally located in the western South Pacific sector extends progressively eastward with increasing El Niño amplitude, reducing wave propagation into the ASR. The wave reflection surface is associated with curvature in the upper tropospheric zonal winds which intensifies as the subtropical jet strengthens under El Niño forcing. In contrast, the El Niño–ASR teleconnection in austral summer, which more closely resembles the Southern Annular Mode, is found to increase linearly for El Niño amplitudes up to 3 K. The results explicitly demonstrate that a linear approximation of the El Niño teleconnection to the ASR is reasonable based on the range of El Niño amplitudes observed in recent history. Text Amundsen Sea Antarc* Antarctic PubMed Central (PMC) Amundsen Sea Antarctic Austral Pacific Quarterly Journal of the Royal Meteorological Society 146 728 1169 1183 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Research Articles |
spellingShingle |
Research Articles Yiu, Yu Yeung Scott Maycock, Amanda C. The linearity of the El Niño teleconnection to the Amundsen Sea region |
topic_facet |
Research Articles |
description |
El Niño Southern Oscillation (ENSO) drives interannual variability in West Antarctic climate through altering atmospheric circulation in the Amundsen Sea region (ASR). The El Niño–ASR teleconnection is known to be strongest in austral winter and spring, but its variation with El Niño amplitude is underexplored. This study uses experiments from the HadGEM3‐A climate model to investigate the El Niño–ASR teleconnection for a range of imposed SST perturbations spanning weak (0.75 K) to strong (3 K) amplitudes. In austral winter, the El Niño–ASR teleconnection behaves linearly for El Niño amplitudes up to 2.25 K, but is found to weaken for stronger forcing (3 K). The anomalous Rossby wave source in the subtropical South Pacific increases monotonically with El Niño amplitude. However, a Rossby wave reflection surface originally located in the western South Pacific sector extends progressively eastward with increasing El Niño amplitude, reducing wave propagation into the ASR. The wave reflection surface is associated with curvature in the upper tropospheric zonal winds which intensifies as the subtropical jet strengthens under El Niño forcing. In contrast, the El Niño–ASR teleconnection in austral summer, which more closely resembles the Southern Annular Mode, is found to increase linearly for El Niño amplitudes up to 3 K. The results explicitly demonstrate that a linear approximation of the El Niño teleconnection to the ASR is reasonable based on the range of El Niño amplitudes observed in recent history. |
format |
Text |
author |
Yiu, Yu Yeung Scott Maycock, Amanda C. |
author_facet |
Yiu, Yu Yeung Scott Maycock, Amanda C. |
author_sort |
Yiu, Yu Yeung Scott |
title |
The linearity of the El Niño teleconnection to the Amundsen Sea region |
title_short |
The linearity of the El Niño teleconnection to the Amundsen Sea region |
title_full |
The linearity of the El Niño teleconnection to the Amundsen Sea region |
title_fullStr |
The linearity of the El Niño teleconnection to the Amundsen Sea region |
title_full_unstemmed |
The linearity of the El Niño teleconnection to the Amundsen Sea region |
title_sort |
linearity of the el niño teleconnection to the amundsen sea region |
publisher |
John Wiley & Sons, Ltd |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7317404/ https://doi.org/10.1002/qj.3731 |
geographic |
Amundsen Sea Antarctic Austral Pacific |
geographic_facet |
Amundsen Sea Antarctic Austral Pacific |
genre |
Amundsen Sea Antarc* Antarctic |
genre_facet |
Amundsen Sea Antarc* Antarctic |
op_source |
Q J R Meteorol Soc |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7317404/ http://dx.doi.org/10.1002/qj.3731 |
op_rights |
© 2019 The Authors. Quarterly Journal of the Royal Meteorological Society published by John Wiley & Sons Ltd on behalf of the Royal Meteorological Society. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/qj.3731 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
146 |
container_issue |
728 |
container_start_page |
1169 |
op_container_end_page |
1183 |
_version_ |
1766376302985609216 |